Key-actuated barrel-type locks

Abstract

A lock having a key-actuated rotary barrel. Said key comprises a holding head axially slidably mounted on a body which head has a radial abutment. The lock has a key entrance surface spaced from the key entrance of the barrel and said surface has a key inserting opening having at least one radial abutment cooperable with said radial abutment of the key head for an axial position of the key head with respect to the key body.

What is claimed is: 
     
       1. In combination, a lock having a body and a rotary barrel and a key comprising a manipulating head and an operating stem for insertion into, and cooperation with, said barrel, means mounting said head to be axially shiftable relative to said stem between a first and a second position, abutment means on said head and means on said lock defining two angularly spaced abutment surfaces cooperating with said abutment means, said abutment surfaces being axially disposed to be engageable by said abutment means in said first position to permit rotation of said head in said first position between said surfaces and to preclude rotation beyond said surfaces and, in said second position, to be disengaged from said surfaces to permit rotation of said head beyond at least one of said surfaces. 
     
     
       2. A combination as claimed in claim 1 wherein said second position is closer to a distal end of said stem than said first position. 
     
     
       3. A combination as claimed in claim 1, wherein said means on said lock defining said surfaces is constituted by a cover plate attached to the lock body. 
     
     
       4. A combination as claimed in claim 1 wherein means are provided biasing said head part in one direction longitudinally of said stem between said first and second positions. 
     
     
       5. A combination as claimed in claim 4 wherein said biasing means bias said head part in a direction away from a leading end of said stem. 
     
     
       6. A combination as claimed in claim 1 wherein said head part and said stem are telescopically mounted one upon another, said stem having a male configuration received within a correspondingly shaped female configuration of said head part.